i dont want to use an mobo intergrated graphics solution, because these are not upgradable.
Motherboards with onboard graphics can be upgraded by adding a discreet video card and disabling the onboard video.According to Anandtech
, the HD5570 is the perfect HTPC card, identical to the HD5670 in HTPC performance. If you need more gaming muscle go for the HD5670. If media playback is all you need then onboard graphics or the HD5570 will work just fine.